Senior FastAPI Development ServicesDevelopment Services
Ship a production-ready FastAPI backend in 8-12 weeks. Senior Python engineers, fixed pricing, full ownership.
IRPR builds FastAPI backends for SaaS products, mobile apps, and internal tools. We use async endpoints, Pydantic v2 for validation, SQLAlchemy 2.0 for ORM, and PostgreSQL or MongoDB for storage.
Every project ships in 8-12 weeks at a fixed price ranging from $80K to $250K. We handle deployment on AWS ECS, monitoring with Datadog, and compliance like HIPAA, PCI-DSS, SOC 2, or FERPA.
CTOs needing a scalable API foundation, founders launching a two-sided marketplace, and engineering managers migrating from Flask or Django to async FastAPI all hire us. Each gets a single point of contact, weekly demos, and full code ownership.
Types of software we ship.
FastAPI SaaS Backend
Multi-tenant API with Stripe billing, user roles, and Celery background tasks. Deployed with Docker on AWS Fargate.
FastAPI Mobile App API
RESTful endpoints for iOS/Android with JWT auth, push notifications via Firebase, and real-time updates through WebSockets.
FastAPI Microservices Platform
Event-driven architecture using RabbitMQ, gRPC inter-service calls, and separate data stores per service on Kubernetes.
FastAPI Data Pipeline
ETL processes with async I/O, Pandas transformation, and direct loading to Snowflake or Redshift. Scheduled via Celery beat.
FastAPI Chatbot Backend
Dialog management with LangChain integration, OpenAI streaming responses, and Redis for conversation state persistence.
FastAPI Ecommerce API
Catalog, cart, checkout, and order management with Stripe Connect, inventory sync via Shopify Admin API, and Algolia search.
FastAPI Real-Time Dashboard
WebSocket-based live metrics using Server-Sent Events, Redis pub/sub for scaling, and Chart.js frontend integration.
FastAPI Auth & Identity Service
OAuth2 with Google/GitHub, magic link login, session management via Redis, and role-based access control using Casbin.
We build for every business type.
HealthTech
FinTech
SaaS Products
Ecommerce
Logistics & Supply Chain
Senior FastAPI Development Services by the Numbers
Our senior engineers have shipped 200+ production FastAPI applications across 50 countries.
Every FastAPI backend we build starts with a Roadmap phase (week 1-2) where we define endpoints, data models, and async event flows. That Roadmap becomes a fixed-price contract -- no hourly billing, no scope creep.
Typical projects include 20-40 API endpoints, automated tests with pytest-asyncio, and a CI/CD pipeline on GitHub Actions deploying to AWS ECS. We also configure Datadog APM for latency monitoring and Sentry for error tracking.
How We Deliver Better FastAPI Results
Generic dev shops hand you code that rots. IRPR builds production-grade FastAPI backends that last.
Most agencies write blocking I/O code in FastAPI because they do not understand async patterns. They skip background task queues and deploy without proper secret management.
IRPR ships every FastAPI backend with async database sessions, Celery for background jobs, and environment variables encrypted via AWS Secrets Manager. We also include OpenAPI documentation via FastAPI's auto schema.
- sync SQLAlchemy calls block the event loop
- no background workers for long tasks
- secrets hard-coded in config files
- no API versioning strategy
- zero load testing before launch
- one-shot delivery with no monitoring
- async session per request with connection pooling
- Celery workers for emails, PDFs, and ETL
- secrets in AWS Secrets Manager with rotation
- URL prefix versioning (v1, v2) from day one
- locust-based load testing at 1000+ req/s
- Datadog dashboards + PagerDuty alerts
Our Process for FastAPI Backend Projects
From idea to production in 8-12 weeks, with fixed pricing and weekly demos.
Phase 1 (week 1-2) is the Roadmap: we define data models, API endpoints, and integration points. You get a fixed price and a clear timeline.
Phase 2 (week 3-8) is building: we code all endpoints, write tests, and deploy to a staging environment. You get a demo every Friday.
What Ships with Every FastAPI Backend
You get a production-ready API that your team can maintain and scale immediately.
IRPR delivers more than code. You receive full documentation, runbooks, and training so your engineers can own the backend after week 12.
All code is written in Python 3.12 with type hints. We use ruff for linting and mypy for static type checking.
- Source code in your GitHub repo with full history
- OpenAPI (Swagger) docs auto-generated by FastAPI
- CI/CD pipeline using GitHub Actions + AWS ECS deploy
- Database migrations with Alembic
- 20+ async unit tests with pytest-asyncio
- Locust load test script targeting 1000 req/s
- Docker Compose local dev environment
- AWS Secrets Manager setup for all secrets
- Datadog dashboard with 15+ widgets
- Sentry project with alert rules
What we ship in this practice.
Telehealth Platform Backend
Built a FastAPI backend for a telehealth startup. Async WebSocket for real-time video signaling, HIPAA-compliant logging, and Celery for appointment reminders. Reduced provider no-shows by 40%. Tech stack: FastAPI, WebRTC, Celery, PostgreSQL, AWS ECS.
Subscription SaaS Analytics API
Developed a multi-tenant FastAPI API for a B2B analytics SaaS. Handles 5000 req/s with async endpoints and Redis caching. Integrated Stripe for billing. Achieved 99.99% uptime over 12 months. Tech stack: FastAPI, Redis, PostgreSQL, Stripe, Datadog.
FinTech Payment Gateway
Created a PCI-DSS compliant FastAPI microservice for payment tokenization. Uses async calls to Stripe and Plaid, with background workers for reconciliation. Processed $50M in transactions in first quarter. Tech stack: FastAPI, Celery, Stripe Connector, AWS Secrets Manager.
Ecommerce Recommendation Engine
Built a FastAPI service that serves personalized product recommendations via REST endpoints. Uses Redis for session caching and Syften for real-time social listening. Increased average order value by 18%. Tech stack: FastAPI, Redis, Elasticsearch, Syften API.
EdTech Assessment Platform
Delivered a FastAPI backend for online assessments with real-time grading via async tasks. FERPA compliant with audit trails. Scaled to 10,000 concurrent users during exam peak. Tech stack: FastAPI, Celery, PostgreSQL, Redis, AWS Lambda.
Logistics Route Optimization API
Built a FastAPI microservice for route optimization using OR-Tools. Async endpoints handle 1000+ route calculations per minute. Reduced fuel costs by 12% for a fleet of 200 trucks. Tech stack: FastAPI, OR-Tools, PostgreSQL, MQTT, AWS ECS.
Why teams hire us.
Fixed price from week 2
After the Roadmap phase (week 1-2) we give you a fixed price for the entire project. No hourly billing, no surprise invoices. Your budget is locked from day 10.
Senior engineers only
IRPR does not use junior or mid-level developers. Every team member has 8+ years of Python experience and has shipped at least 5 FastAPI projects. You talk directly to the engineer building your API.
8-12 week delivery guarantee
We ship production-ready backends in 8 to 12 weeks. 98% of our projects finish on time. If we miss the deadline you do not pay for the extra weeks.
Full code ownership
You own every line of code from day one. IRPR never licenses or retains IP. We transfer the GitHub repo, AWS account, and all credentials at the end of week 12.
Production readiness included
Every FastAPI backend ships with CI/CD, monitoring, error tracking, and load tests. Most agencies deliver code only -- IRPR delivers a running system in the cloud.
Compliance built in
We build HIPAA, PCI-DSS, SOC 2, or FERPA compliance into every FastAPI backend. Our engineers know how to encrypt data at rest, audit logs, and configure WAF rules.
Idea → Roadmap → Product → Release.
Every engagement runs through the same four-stage pipeline. Predictable by design.
Questions clients ask first.
Related services and industries.
Ready to build? Let's talk.
30-minute discovery call. No deck. We'll tell you honestly what it takes, how long, and how much.
─── share this page ───
